. >>> it should not be long before jurors in the jodi arias trial start besiding her fate. today her defense attorneys present their closing arguments just one day after prosecutors went after her. they accused her of being a liar who killed her boyfriend in cold blood. here's ted row lands. >> absolutely without a shadow of a doubt she's a liar. >> reporter: jodi arias broke down listening to prosecutor juan martinez methodically lay out his closing argument that she is a cold-blooded killer who premeditated the murder of her ex-boyfriend, travis alexander. >> she knew, she absolutely knew and had already planned it. she knew that she was going to kill him. >> reporter: martinez told jurors that in 2008 arias drove from northern california to alexander's home in mesa, arizona, armed with a knife and a stolen gun she took from her grandparents. she used cans of gasoline to refuel her car and turned off her cell phone to avoid leaving a trail. >> she knew that she was covering to kill him. >> reporter: family members openly wep as martinez, using graphic photos from the crim